If you travel between countries that use different languages and varying currencies, adjusting your iOS device to use the local standards can be helpful. You can easily change both the region and language on your iPhone or iPad—here’s how.
When you set up a new iPhone or iPad you’re asked to confirm language and region there and then, but that doesn’t mean that those settings will always be correct. You might want to move to a new country, or even learn a new language, at which point changing a previous setting makes lots of sense. You might even find yourself in a position where you accidentally changed the language or region settings and don’t know how to change them back.
How to Change Your Region
Note that by changing your region, things like the default currency and temperature unit will also change depending on the region chosen.
Open the Settings app to get the ball rolling. Then tap the “General” button to proceed.
Next, tap “Language & Region.”
Tap “Region.”
Read the remaining 16 paragraphs
Source : How to Change Your Language and Region on iPhone and iPad
